library(tidyverse)     # for data cleaning and plotting
library(googlesheets4) # for reading googlesheet data
library(lubridate)     # for date manipulation
library(openintro)     # for the abbr2state() function
library(palmerpenguins)# for Palmer penguin data
library(maps)          # for map data
library(ggmap)         # for mapping points on maps
library(gplots)        # for col2hex() function
library(RColorBrewer)  # for color palettes
library(sf)            # for working with spatial data
library(leaflet)       # for highly customizable mapping
library(carData)       # for Minneapolis police stops data
library(ggthemes)      # for more themes (including theme_map())
gs4_deauth()           # To not have to authorize each time you knit.
theme_set(theme_minimal())
# Starbucks locations
Starbucks <- read_csv("https://www.macalester.edu/~ajohns24/Data/Starbucks.csv")

starbucks_us_by_state <- Starbucks %>% 
  filter(Country == "US") %>% 
  count(`State/Province`) %>% 
  mutate(state_name = str_to_lower(abbr2state(`State/Province`))) 

# Lisa's favorite St. Paul places - example for you to create your own data
favorite_stp_by_lisa <- tibble(
  place = c("Home", "Macalester College", "Adams Spanish Immersion", 
            "Spirit Gymnastics", "Bama & Bapa", "Now Bikes",
            "Dance Spectrum", "Pizza Luce", "Brunson's"),
  long = c(-93.1405743, -93.1712321, -93.1451796, 
           -93.1650563, -93.1542883, -93.1696608, 
           -93.1393172, -93.1524256, -93.0753863),
  lat = c(44.950576, 44.9378965, 44.9237914,
          44.9654609, 44.9295072, 44.9436813, 
          44.9399922, 44.9468848, 44.9700727)
  )

#COVID-19 data from the New York Times
covid19 <- read_csv("https://raw.githubusercontent.com/nytimes/covid-19-data/master/us-states.csv")

Instructions

  • Put your name at the top of the document.

  • For ALL graphs, you should include appropriate labels.

  • Feel free to change the default theme, which I currently have set to theme_minimal().

  • Use good coding practice. Read the short sections on good code with pipes and ggplot2. This is part of your grade!

  • When you are finished with ALL the exercises, uncomment the options at the top so your document looks nicer. Don’t do it before then, or else you might miss some important warnings and messages.

Warm-up exercises from tutorial

These exercises will reiterate what you learned in the “Mapping data with R” tutorial. If you haven’t gone through the tutorial yet, you should do that first.

Starbucks locations (ggmap)

  1. Add the Starbucks locations to a world map. Add an aesthetic to the world map that sets the color of the points according to the ownership type. What, if anything, can you deduce from this visualization?

From the map we can see that most of the Starbucks are concentrated in the East coast of North America, UK and East and Southeast of Asia. The map shows that most of the Starbucks in California are company owned. In South Korea and Japan, most of the Starbucks are joint ventured, while in China, many Starbucks are company owned.

# Get the map information
world <- get_stamenmap(
    bbox = c(left = -180, bottom = -57, right = 179, top = 82.1), 
    maptype = "terrain",
    zoom = 2)

# Plot the points on the map
ggmap(world) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color = `Ownership Type`), 
             alpha = .7, 
             size = .1) +
  theme_map()

  1. Construct a new map of Starbucks locations in the Twin Cities metro area (approximately the 5 county metro area).
# Get the map information
Twin_Cities_map <- get_stamenmap(
    bbox = c(left = -93.3707, bottom = 44.8719, right = -92.9965, top = 45.0580), 
    maptype = "terrain",
    zoom = 12)

# Plot the points on the map
ggmap(Twin_Cities_map) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color= `Ownership Type`)) +
  theme_map()

  1. In the Twin Cities plot, play with the zoom number. What does it do? (just describe what it does - don’t actually include more than one map).

I change the zoom number from 12 to 10, and the background of the map becomes unclear, showing up less details.

Twin_Cities_map <- get_stamenmap(
    bbox = c(left = -93.3707, bottom = 44.8719, right = -92.9965, top = 45.0580), 
    maptype = "terrain",
    zoom = 10)

ggmap(Twin_Cities_map) +
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color= `Ownership Type`)) +
  theme_map()

  1. Try a couple different map types (see get_stamenmap() in help and look at maptype). Include a map with one of the other map types.
Twin_Cities_map <- get_stamenmap(
    bbox = c(left = -93.3707, bottom = 44.8719, right = -92.9965, top = 45.0580), 
    maptype = "toner",
    zoom = 12)

ggmap(Twin_Cities_map) +
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color= `Ownership Type`)) +
  theme_map()

  1. Add a point to the map that indicates Macalester College and label it appropriately. There are many ways you can do think, but I think it’s easiest with the annotate() function (see ggplot2 cheatsheet).
Twin_Cities_map<-get_stamenmap(
    bbox = c(left = -93.3351, bottom =44.8638, right =-92.9609 , top =45.0499), 
    maptype = "terrain",
    zoom = 12)
ggmap(Twin_Cities_map) + 
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color= `Ownership Type`)) +
  annotate(geom = "point",
           x = -93.1810,
           y = 44.9320,
           color = "Blue",
           size = 2)+
  annotate(geom = "text",
           x =-93.1810,
           y = 44.9320,
           label = "Macalester College",
           size = 4)

  theme_map()
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Choropleth maps with Starbucks data (geom_map())

The example I showed in the tutorial did not account for population of each state in the map. In the code below, a new variable is created, starbucks_per_10000, that gives the number of Starbucks per 10,000 people. It is in the starbucks_with_2018_pop_est dataset.

census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% 
  separate(state, into = c("dot","state"), extra = "merge") %>% 
  select(-dot) %>% 
  mutate(state = str_to_lower(state))

starbucks_with_2018_pop_est <-
  starbucks_us_by_state %>% 
  left_join(census_pop_est_2018,
            by = c("state_name" = "state")) %>% 
  mutate(starbucks_per_10000 = (n/est_pop_2018)*10000)
  1. dplyr review: Look through the code above and describe what each line of code does.
census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% 
  #gets data from the csv file
  separate(state, into = c("dot","state"), extra = "merge") %>% # separates "dot" and "state" variables, using extra and "merge" to split at most length times. Make sure that "sparate" function does not return "New York" as "New".  
  select(-dot) %>% # singles out the "dot" variable
  mutate(state = str_to_lower(state))#changes state_name all to lower-case letters

starbucks_with_2018_pop_est <-
  starbucks_us_by_state %>% 
  left_join(census_pop_est_2018,# combines census_pop_est_2018 and starbucks_us_by_state to create the dataset starbucks_with_2018_pop_est
            by = c("state_name" = "state")) %>% 
  mutate(starbucks_per_10000 = (n/est_pop_2018)*10000)# adds a new column to the new dataset starbucks_with_2018_pop_est called "starbucks_per_10000", and starbucks_per_10000 = (n/est_pop_2018)*10000.
  1. Create a choropleth map that shows the number of Starbucks per 10,000 people on a map of the US. Use a new fill color, add points for all Starbucks in the US (except Hawaii and Alaska), add an informative title for the plot, and include a caption that says who created the plot (you!). Make a conclusion about what you observe.

Conclusion: The map shows that the number of Starbucks per 10,000 people is higher in the East Coast and West Coast, but lower in Central. It also shows that California has the largest number of Starbucks in the U.S.

states_map <- map_data("state")
starbucks_in_us <- Starbucks %>% 
  filter(Country == "US",!(`State/Province` %in% c("AK", "HI")))%>% 
  select("State/Province","Longitude", "Latitude" ) %>% 
  mutate(state_name = str_to_lower(abbr2state(`State/Province`))) 

starbucks_with_2018_pop_est %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state_name,
               fill = n)) +
  geom_point(data = starbucks_in_us,
             aes(x = Longitude, y = Latitude),
             size = .05,
             alpha = .2, 
             color = "goldenrod") +
  expand_limits(x = states_map$long, y = states_map$lat) + 
  labs(title = "The Number of Starbucks per 10,000 People in the US") +
  theme_map() +
  theme(legend.background = element_blank())

A few of your favorite things (leaflet)

  1. In this exercise, you are going to create a single map of some of your favorite places! The end result will be one map that satisfies the criteria below.
  • Create a data set using the tibble() function that has 10-15 rows of your favorite places. The columns will be the name of the location, the latitude, the longitude, and a column that indicates if it is in your top 3 favorite locations or not. For an example of how to use tibble(), look at the favorite_stp_by_lisa I created in the data R code chunk at the beginning.
favorite_places <- tibble(
  place = c("Apartment", "Macalester College", "Sencha", 
            "Kimchi Tofu House", "St. Paul Public Library", "Everest on Grand",
            "Minnehaha Park", "Café Latte", "Kowalski","Whole Foods"),
  long = c(-93.16524, -93.1810, -93.17350, 
           -93.22838, -93.09855, -93.15558, 
           -93.4187, -93.13760, -93.15436, -93.16819),
  lat = c(44.93339, 44.9320, 44.93923,
          44.97256, 44.94300, 44.93918, 
          44.9307, 44.93901, 44.93943, 44.94601),
  top_three = c(TRUE, TRUE, FALSE, FALSE, TRUE, FALSE,FALSE, FALSE,FALSE, FALSE)
  )
  • Create a leaflet map that uses circles to indicate your favorite places. Label them with the name of the place. Choose the base map you like best. Color your 3 favorite places differently than the ones that are not in your top 3 (HINT: colorFactor()). Add a legend that explains what the colors mean.
pal <- colorFactor(palette(c("red", "blue")),
                   domain = favorite_places$top_three)
  
leaflet(data=favorite_places)%>%
  addTiles()%>%
  addProviderTiles(providers$CartoDB.DarkMatter)%>%
  addCircles(lng = ~long,
             lat = ~lat,
             label = ~place,
             weight = 10,
             opacity = 1,
             color = ~pal(top_three))%>%
  addLegend("bottomleft",
            pal = pal,
            values = ~top_three,
            opacity = 1)
  • Connect all your locations together with a line in a meaningful way (you may need to order them differently in the original data).
pal <- colorFactor(palette(c("red", "blue")),
                   domain = favorite_places$top_three)
  
leaflet(data=favorite_places)%>%
  addTiles()%>%
  addProviderTiles(providers$CartoDB.DarkMatter)%>%
  addCircles(lng = ~long,
             lat = ~lat,
             label = ~place,
             weight = 10,
             opacity = 1,
             color = ~pal(top_three))%>%
  addLegend("bottomleft",
            pal = pal,
            values = ~top_three,
            opacity = 1)%>%
  addPolylines(lng = ~long,
               lat = ~lat,
               color="white",
               weight = 1)
  • If there are other variables you want to add that could enhance your plot, do that now.

Revisiting old datasets

This section will revisit some datasets we have used previously and bring in a mapping component.

Bicycle-Use Patterns

The data come from Washington, DC and cover the last quarter of 2014.

Two data tables are available:

  • Trips contains records of individual rentals
  • Stations gives the locations of the bike rental stations

Here is the code to read in the data. We do this a little differently than usualy, which is why it is included here rather than at the top of this file. To avoid repeatedly re-reading the files, start the data import chunk with {r cache = TRUE} rather than the usual {r}. This code reads in the large dataset right away.

data_site <- 
  "https://www.macalester.edu/~dshuman1/data/112/2014-Q4-Trips-History-Data.rds" 
Trips <- readRDS(gzcon(url(data_site)))
Stations<-read_csv("http://www.macalester.edu/~dshuman1/data/112/DC-Stations.csv")
  1. Use the latitude and longitude variables in Stations to make a visualization of the total number of departures from each station in the Trips data. Use either color or size to show the variation in number of departures. This time, plot the points on top of a map. Use any of the mapping tools you’d like.
Stations%>%
  summarise(min(lat),
            max(lat),
            min(long),
            max(long))
dc_map<-get_stamenmap(
  bbox = c(left = -77.2025, bottom = 38.80111, right = -76.93186, top = 39.12351),
  maptype = "terrain",
  zoom = 11)
departure_by_station<-Trips%>%
  left_join(Stations, by = c("sstation" = "name"))%>%
  group_by(lat, long)%>%
  summarise(n=n())
ggmap(dc_map)+
  geom_point(data=departure_by_station,
             aes(x=long,
             y=lat,
             color=n),
  alpha=0.8,
  shape=17)+
  scale_color_viridis_c()

  1. Only 14.4% of the trips in our data are carried out by casual users. Create a plot that shows which area(s) have stations with a much higher percentage of departures by casual users. What patterns do you notice? Also plot this on top of a map. I think it will be more clear what the patterns are.

Stations with a high percentage of departures by casual users are concentrated in the area with longitude -77.05 and latitutde 38.9. The percentage of departures by casual users is lower in areas with higher latitude.

Stations%>%
  summarise(min(lat),
            max(lat),
            min(long),
            max(long))
dc_map<-get_stamenmap(
  bbox = c(left = -77.2025, bottom = 38.80111, right = -76.93186, top = 39.12351),
  maptype = "terrain",
  zoom = 11)
departure_by_station<-Trips%>%
  left_join(Stations, by = c("sstation" = "name"))%>%
  group_by(lat, long)%>%
  summarise(n=n(), prop_casual = mean(client == "Casual"))
ggmap(dc_map)+
  geom_point(data=departure_by_station,
             aes(x=long,
             y=lat,
             color=prop_casual),
  alpha=0.8,
  shape=17)+
  scale_color_viridis_c()

COVID-19 data

The following exercises will use the COVID-19 data from the NYT.

  1. Create a map that colors the states by the most recent cumulative number of COVID-19 cases (remember, these data report cumulative numbers so you don’t need to compute that). Describe what you see. What is the problem with this map?

The map shows the cumulative number of Covid19 in each state. From the graph, we can see that Texas and California have the most cumulative cases in the U.S.. The problem with this map is that it doesn’t show the relationship between the number of cumulative cases and the population density, given that each state has different population.

states_map<-map_data("state")

covid19%>%
  group_by(state)%>%
  summarise(total = max(cases))%>%
  mutate(state = str_to_lower(state))%>%
  ggplot()+
  geom_map(map = states_map,
           aes(map_id = state,
               fill = total))+
  expand_limits(x = states_map$long, y = states_map$lat)+
  theme_map()

  1. Now add the population of each state to the dataset and color the states by most recent cumulative cases/10,000 people. See the code for doing this with the Starbucks data. You will need to make some modifications.
census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% 
  separate(state, into = c("dot","state"), extra = "merge") %>% 
  select(-dot) %>% 
  mutate(state = str_to_lower(state))

covid19%>%
  group_by(state)%>%
  summarise(total=max(cases))%>%
  mutate(state = str_to_lower(state))%>%
  left_join(census_pop_est_2018,
            by=c("state"="state"))%>%
  mutate(num_cases_per_10000 = (total/est_pop_2018)*10000)%>%
  ggplot()+
  geom_map(map = states_map,
           aes(map_id = state,
               fill = num_cases_per_10000))+
  expand_limits(x = states_map$long, y = states_map$lat)+
  theme_map()

  1. CHALLENGE Choose 4 dates spread over the time period of the data and create the same map as in exercise 12 for each of the dates. Display the four graphs together using faceting. What do you notice?

Minneapolis police stops

These exercises use the datasets MplsStops and MplsDemo from the carData library. Search for them in Help to find out more information.

  1. Use the MplsStops dataset to find out how many stops there were for each neighborhood and the proportion of stops that were for a suspicious vehicle or person. Sort the results from most to least number of stops. Save this as a dataset called mpls_suspicious and display the table.
summary(MplsStops)
##        idNum            date                           problem     
##  17-000003:    1   Min.   :2017-01-01 00:00:42   suspicious:25822  
##  17-000007:    1   1st Qu.:2017-03-29 08:35:09   traffic   :26098  
##  17-000073:    1   Median :2017-06-17 18:46:47                     
##  17-000092:    1   Mean   :2017-06-23 19:57:49                     
##  17-000098:    1   3rd Qu.:2017-09-18 18:32:06                     
##  17-000111:    1   Max.   :2017-12-31 23:52:35                     
##  (Other)  :51914                                                   
##     MDC        citationIssued personSearch vehicleSearch
##  MDC  :43699   NO  :15899     NO  :38462   NO  :40579   
##  other: 8221   YES : 3211     YES : 5237   YES : 3120   
##                NA's:32810     NA's: 8221   NA's: 8221   
##                                                         
##                                                         
##                                                         
##                                                         
##             preRace                race           gender           lat       
##  Unknown        :28337   Black       :15220   Female :10015   Min.   :44.89  
##  Black          : 6805   White       :11703   Male   :27131   1st Qu.:44.95  
##  White          : 6004   Unknown     : 9219   Unknown: 6492   Median :44.98  
##  Native American:  908   East African: 2188   NA's   : 8282   Mean   :44.97  
##  Latino         :  528   Latino      : 1858                   3rd Qu.:45.00  
##  (Other)        : 1117   (Other)     : 3511                   Max.   :45.05  
##  NA's           : 8221   NA's        : 8221                                  
##       long        policePrecinct         neighborhood  
##  Min.   :-93.33   Min.   :1.000   Downtown West: 4409  
##  1st Qu.:-93.29   1st Qu.:2.000   Whittier     : 3328  
##  Median :-93.28   Median :3.000   Near - North : 2256  
##  Mean   :-93.27   Mean   :3.257   Lyndale      : 2154  
##  3rd Qu.:-93.25   3rd Qu.:4.000   Jordan       : 2075  
##  Max.   :-93.20   Max.   :5.000   Hawthorne    : 2031  
##                                   (Other)      :35667
mpls_suspicious<-MplsStops%>%
  group_by(neighborhood)%>%
  summarise(number_stops = n(),
            n_suspicious = sum(problem == "suspicious"),
            prop_suspicious = n_suspicious/number_stops)%>%
  arrange(desc(number_stops))
  1. Use a leaflet map and the MplsStops dataset to display each of the stops on a map as a small point. Color the points differently depending on whether they were for suspicious vehicle/person or a traffic stop (the problem variable). HINTS: use addCircleMarkers, set stroke = FAlSE, use colorFactor() to create a palette.
pal_problem<-colorFactor("viridis", 
                         domain = MplsStops$problem)
leaflet(MplsStops)%>%
  addProviderTiles(providers$Stamen.Toner)%>%
  addCircles(lng = ~long,
             lat = ~lat,
             color = ~pal_problem(problem),
             weight = 0.5,
             opacity = 0.4)%>%
  addLegend(pal = pal_problem,
            values = ~problem)
  1. Save the folder from moodle called Minneapolis_Neighborhoods into your project/repository folder for this assignment. Make sure the folder is called Minneapolis_Neighborhoods. Use the code below to read in the data and make sure to delete the eval=FALSE. Although it looks like it only links to the .sph file, you need the entire folder of files to create the mpls_nbhd data set. These data contain information about the geometries of the Minneapolis neighborhoods. Using the mpls_nbhd dataset as the base file, join the mpls_suspicious and MplsDemo datasets to it by neighborhood (careful, they are named different things in the different files). Call this new dataset mpls_all.
mpls_nbhd <- st_read("Minneapolis_Neighborhoods/Minneapolis_Neighborhoods.shp", quiet = TRUE)
mpls_all<-mpls_nbhd %>%
  left_join(mpls_suspicious,
            by = c("BDNAME" = "neighborhood"))%>%
  left_join(MplsDemo,
            by = c("BDNAME" = "neighborhood"))
  1. Use leaflet to create a map from the mpls_all data that colors the neighborhoods by prop_suspicious. Display the neighborhood name as you scroll over it. Describe what you observe in the map.
pal_sus<-colorNumeric("viridis",
                      domain = mpls_all$prop_suspicious)
leaflet(mpls_all)%>%
  addProviderTiles(providers$Stamen.Toner)%>%
  addPolygons(fillColor = ~pal_sus(prop_suspicious),
              fillOpacity = 0.5,
              label = ~BDNAME,
              color = "black",
              weight = 1,
              opacity = 1)%>%
  addLegend(pal = pal_sus,
            values = ~prop_suspicious)
  1. Use leaflet to create a map of your own choosing. Come up with a question you want to try to answer and use the map to help answer that question. Describe what your map shows. Question:Where do most of my favorite places concentrate? My map shows where my favorite places locate in Twin Cities. It also shows that most of my favorite places concentrate in St. Paul. Many of them are places around campus.
pal <- colorFactor(palette(c("red", "blue")),
                   domain = favorite_places$top_three)
  
leaflet(data=favorite_places)%>%
  addTiles()%>%
  addProviderTiles(providers$CartoDB.Voyager)%>%
  addCircles(lng = ~long,
             lat = ~lat,
             label = ~place,
             weight = 10,
             opacity = 1,
             color = ~pal(top_three))%>%
  addLegend("bottomleft",
            pal = pal,
            values = ~top_three,
            opacity = 1)%>%
  addPolylines(lng = ~long,
               lat = ~lat,
               color="white",
               weight = 1)

GitHub link

  1. Below, provide a link to your GitHub page with this set of Weekly Exercises. Specifically, if the name of the file is 04_exercises.Rmd, provide a link to the 04_exercises.md file, which is the one that will be most readable on GitHub. github_link
---
title: 'Weekly Exercises #4'
author: "Jiashu Liu"
output: 
  html_document:
    keep_md: TRUE
    toc: TRUE
    toc_float: TRUE
    df_print: paged
    code_download: true
---


```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE, error=TRUE, message=FALSE, warning=FALSE)
```

```{r libraries}
library(tidyverse)     # for data cleaning and plotting
library(googlesheets4) # for reading googlesheet data
library(lubridate)     # for date manipulation
library(openintro)     # for the abbr2state() function
library(palmerpenguins)# for Palmer penguin data
library(maps)          # for map data
library(ggmap)         # for mapping points on maps
library(gplots)        # for col2hex() function
library(RColorBrewer)  # for color palettes
library(sf)            # for working with spatial data
library(leaflet)       # for highly customizable mapping
library(carData)       # for Minneapolis police stops data
library(ggthemes)      # for more themes (including theme_map())
gs4_deauth()           # To not have to authorize each time you knit.
theme_set(theme_minimal())
```

```{r data}
# Starbucks locations
Starbucks <- read_csv("https://www.macalester.edu/~ajohns24/Data/Starbucks.csv")

starbucks_us_by_state <- Starbucks %>% 
  filter(Country == "US") %>% 
  count(`State/Province`) %>% 
  mutate(state_name = str_to_lower(abbr2state(`State/Province`))) 

# Lisa's favorite St. Paul places - example for you to create your own data
favorite_stp_by_lisa <- tibble(
  place = c("Home", "Macalester College", "Adams Spanish Immersion", 
            "Spirit Gymnastics", "Bama & Bapa", "Now Bikes",
            "Dance Spectrum", "Pizza Luce", "Brunson's"),
  long = c(-93.1405743, -93.1712321, -93.1451796, 
           -93.1650563, -93.1542883, -93.1696608, 
           -93.1393172, -93.1524256, -93.0753863),
  lat = c(44.950576, 44.9378965, 44.9237914,
          44.9654609, 44.9295072, 44.9436813, 
          44.9399922, 44.9468848, 44.9700727)
  )

#COVID-19 data from the New York Times
covid19 <- read_csv("https://raw.githubusercontent.com/nytimes/covid-19-data/master/us-states.csv")

```

Instructions

* Put your name at the top of the document. 

* **For ALL graphs, you should include appropriate labels.** 

* Feel free to change the default theme, which I currently have set to `theme_minimal()`. 

* Use good coding practice. Read the short sections on good code with [pipes](https://style.tidyverse.org/pipes.html) and [ggplot2](https://style.tidyverse.org/ggplot2.html). **This is part of your grade!**

* When you are finished with ALL the exercises, uncomment the options at the top so your document looks nicer. Don't do it before then, or else you might miss some important warnings and messages.


## Warm-up exercises from tutorial

These exercises will reiterate what you learned in the "Mapping data with R" tutorial. If you haven't gone through the tutorial yet, you should do that first.

### Starbucks locations (`ggmap`)

  1. Add the `Starbucks` locations to a world map. Add an aesthetic to the world map that sets the color of the points according to the ownership type. What, if anything, can you deduce from this visualization?  
  
From the map we can see that most of the Starbucks are concentrated in the East coast of North America, UK and East and Southeast of Asia. The map shows that most of the Starbucks in California are company owned. In South Korea and Japan, most of the Starbucks are joint ventured, while in China, many Starbucks are company owned. 
```{r}
# Get the map information
world <- get_stamenmap(
    bbox = c(left = -180, bottom = -57, right = 179, top = 82.1), 
    maptype = "terrain",
    zoom = 2)

# Plot the points on the map
ggmap(world) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color = `Ownership Type`), 
             alpha = .7, 
             size = .1) +
  theme_map()
```
  

  2. Construct a new map of Starbucks locations in the Twin Cities metro area (approximately the 5 county metro area).  
  
```{r}
# Get the map information
Twin_Cities_map <- get_stamenmap(
    bbox = c(left = -93.3707, bottom = 44.8719, right = -92.9965, top = 45.0580), 
    maptype = "terrain",
    zoom = 12)

# Plot the points on the map
ggmap(Twin_Cities_map) + # creates the map "background"
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color= `Ownership Type`)) +
  theme_map()
```


  3. In the Twin Cities plot, play with the zoom number. What does it do?  (just describe what it does - don't actually include more than one map).  
  
I change the zoom number from 12 to 10, and the background of the map becomes unclear, showing up less details.  
```{r}

Twin_Cities_map <- get_stamenmap(
    bbox = c(left = -93.3707, bottom = 44.8719, right = -92.9965, top = 45.0580), 
    maptype = "terrain",
    zoom = 10)

ggmap(Twin_Cities_map) +
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color= `Ownership Type`)) +
  theme_map()
```

  4. Try a couple different map types (see `get_stamenmap()` in help and look at `maptype`). Include a map with one of the other map types.  
  
```{r}
Twin_Cities_map <- get_stamenmap(
    bbox = c(left = -93.3707, bottom = 44.8719, right = -92.9965, top = 45.0580), 
    maptype = "toner",
    zoom = 12)

ggmap(Twin_Cities_map) +
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color= `Ownership Type`)) +
  theme_map()
```

  5. Add a point to the map that indicates Macalester College and label it appropriately. There are many ways you can do think, but I think it's easiest with the `annotate()` function (see `ggplot2` cheatsheet).
```{r}
Twin_Cities_map<-get_stamenmap(
    bbox = c(left = -93.3351, bottom =44.8638, right =-92.9609 , top =45.0499), 
    maptype = "terrain",
    zoom = 12)
ggmap(Twin_Cities_map) + 
  geom_point(data = Starbucks, 
             aes(x = Longitude, y = Latitude, color= `Ownership Type`)) +
  annotate(geom = "point",
           x = -93.1810,
           y = 44.9320,
           color = "Blue",
           size = 2)+
  annotate(geom = "text",
           x =-93.1810,
           y = 44.9320,
           label = "Macalester College",
           size = 4)
  theme_map()
```

### Choropleth maps with Starbucks data (`geom_map()`)

The example I showed in the tutorial did not account for population of each state in the map. In the code below, a new variable is created, `starbucks_per_10000`, that gives the number of Starbucks per 10,000 people. It is in the `starbucks_with_2018_pop_est` dataset.

```{r}
census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% 
  separate(state, into = c("dot","state"), extra = "merge") %>% 
  select(-dot) %>% 
  mutate(state = str_to_lower(state))

starbucks_with_2018_pop_est <-
  starbucks_us_by_state %>% 
  left_join(census_pop_est_2018,
            by = c("state_name" = "state")) %>% 
  mutate(starbucks_per_10000 = (n/est_pop_2018)*10000)
```

  6. **`dplyr` review**: Look through the code above and describe what each line of code does.

```{r}
census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% 
  #gets data from the csv file
  separate(state, into = c("dot","state"), extra = "merge") %>% # separates "dot" and "state" variables, using extra and "merge" to split at most length times. Make sure that "sparate" function does not return "New York" as "New".  
  select(-dot) %>% # singles out the "dot" variable
  mutate(state = str_to_lower(state))#changes state_name all to lower-case letters

starbucks_with_2018_pop_est <-
  starbucks_us_by_state %>% 
  left_join(census_pop_est_2018,# combines census_pop_est_2018 and starbucks_us_by_state to create the dataset starbucks_with_2018_pop_est
            by = c("state_name" = "state")) %>% 
  mutate(starbucks_per_10000 = (n/est_pop_2018)*10000)# adds a new column to the new dataset starbucks_with_2018_pop_est called "starbucks_per_10000", and starbucks_per_10000 = (n/est_pop_2018)*10000.
```

  7. Create a choropleth map that shows the number of Starbucks per 10,000 people on a map of the US. Use a new fill color, add points for all Starbucks in the US (except Hawaii and Alaska), add an informative title for the plot, and include a caption that says who created the plot (you!). Make a conclusion about what you observe.
  
Conclusion: The map shows that the number of Starbucks per 10,000 people is higher in the East Coast and West Coast, but lower in Central. It also shows that California has the largest number of Starbucks in the U.S. 
```{r}
states_map <- map_data("state")
starbucks_in_us <- Starbucks %>% 
  filter(Country == "US",!(`State/Province` %in% c("AK", "HI")))%>% 
  select("State/Province","Longitude", "Latitude" ) %>% 
  mutate(state_name = str_to_lower(abbr2state(`State/Province`))) 

starbucks_with_2018_pop_est %>% 
  ggplot() +
  geom_map(map = states_map,
           aes(map_id = state_name,
               fill = n)) +
  geom_point(data = starbucks_in_us,
             aes(x = Longitude, y = Latitude),
             size = .05,
             alpha = .2, 
             color = "goldenrod") +
  expand_limits(x = states_map$long, y = states_map$lat) + 
  labs(title = "The Number of Starbucks per 10,000 People in the US") +
  theme_map() +
  theme(legend.background = element_blank())
```

### A few of your favorite things (`leaflet`)

  8. In this exercise, you are going to create a single map of some of your favorite places! The end result will be one map that satisfies the criteria below. 

  * Create a data set using the `tibble()` function that has 10-15 rows of your favorite places. The columns will be the name of the location, the latitude, the longitude, and a column that indicates if it is in your top 3 favorite locations or not. For an example of how to use `tibble()`, look at the `favorite_stp_by_lisa` I created in the data R code chunk at the beginning.  
```{r}
favorite_places <- tibble(
  place = c("Apartment", "Macalester College", "Sencha", 
            "Kimchi Tofu House", "St. Paul Public Library", "Everest on Grand",
            "Minnehaha Park", "Café Latte", "Kowalski","Whole Foods"),
  long = c(-93.16524, -93.1810, -93.17350, 
           -93.22838, -93.09855, -93.15558, 
           -93.4187, -93.13760, -93.15436, -93.16819),
  lat = c(44.93339, 44.9320, 44.93923,
          44.97256, 44.94300, 44.93918, 
          44.9307, 44.93901, 44.93943, 44.94601),
  top_three = c(TRUE, TRUE, FALSE, FALSE, TRUE, FALSE,FALSE, FALSE,FALSE, FALSE)
  )
```

  * Create a `leaflet` map that uses circles to indicate your favorite places. Label them with the name of the place. Choose the base map you like best. Color your 3 favorite places differently than the ones that are not in your top 3 (HINT: `colorFactor()`). Add a legend that explains what the colors mean.  
```{r}
pal <- colorFactor(palette(c("red", "blue")),
                   domain = favorite_places$top_three)
  
leaflet(data=favorite_places)%>%
  addTiles()%>%
  addProviderTiles(providers$CartoDB.DarkMatter)%>%
  addCircles(lng = ~long,
             lat = ~lat,
             label = ~place,
             weight = 10,
             opacity = 1,
             color = ~pal(top_three))%>%
  addLegend("bottomleft",
            pal = pal,
            values = ~top_three,
            opacity = 1)
```
  
  * Connect all your locations together with a line in a meaningful way (you may need to order them differently in the original data).  
```{r}

pal <- colorFactor(palette(c("red", "blue")),
                   domain = favorite_places$top_three)
  
leaflet(data=favorite_places)%>%
  addTiles()%>%
  addProviderTiles(providers$CartoDB.DarkMatter)%>%
  addCircles(lng = ~long,
             lat = ~lat,
             label = ~place,
             weight = 10,
             opacity = 1,
             color = ~pal(top_three))%>%
  addLegend("bottomleft",
            pal = pal,
            values = ~top_three,
            opacity = 1)%>%
  addPolylines(lng = ~long,
               lat = ~lat,
               color="white",
               weight = 1)
```

  
  * If there are other variables you want to add that could enhance your plot, do that now.  
```{r}

```
  
## Revisiting old datasets

This section will revisit some datasets we have used previously and bring in a mapping component. 

### Bicycle-Use Patterns

The data come from Washington, DC and cover the last quarter of 2014.

Two data tables are available:

- `Trips` contains records of individual rentals
- `Stations` gives the locations of the bike rental stations

Here is the code to read in the data. We do this a little differently than usualy, which is why it is included here rather than at the top of this file. To avoid repeatedly re-reading the files, start the data import chunk with `{r cache = TRUE}` rather than the usual `{r}`. This code reads in the large dataset right away.

```{r cache=TRUE}
data_site <- 
  "https://www.macalester.edu/~dshuman1/data/112/2014-Q4-Trips-History-Data.rds" 
Trips <- readRDS(gzcon(url(data_site)))
Stations<-read_csv("http://www.macalester.edu/~dshuman1/data/112/DC-Stations.csv")
```

  9. Use the latitude and longitude variables in `Stations` to make a visualization of the total number of departures from each station in the `Trips` data. Use either color or size to show the variation in number of departures. This time, plot the points on top of a map. Use any of the mapping tools you'd like.
  
```{r}
Stations%>%
  summarise(min(lat),
            max(lat),
            min(long),
            max(long))

dc_map<-get_stamenmap(
  bbox = c(left = -77.2025, bottom = 38.80111, right = -76.93186, top = 39.12351),
  maptype = "terrain",
  zoom = 11)
departure_by_station<-Trips%>%
  left_join(Stations, by = c("sstation" = "name"))%>%
  group_by(lat, long)%>%
  summarise(n=n())
ggmap(dc_map)+
  geom_point(data=departure_by_station,
             aes(x=long,
             y=lat,
             color=n),
  alpha=0.8,
  shape=17)+
  scale_color_viridis_c()
```
  
  10. Only 14.4% of the trips in our data are carried out by casual users. Create a plot that shows which area(s) have stations with a much higher percentage of departures by casual users. What patterns do you notice? Also plot this on top of a map. I think it will be more clear what the patterns are.
  
  
  Stations with a high percentage of departures by casual users are concentrated in the area with longitude -77.05 and latitutde 38.9. The percentage of departures by casual users is lower in areas with higher latitude. 
```{r}
Stations%>%
  summarise(min(lat),
            max(lat),
            min(long),
            max(long))

dc_map<-get_stamenmap(
  bbox = c(left = -77.2025, bottom = 38.80111, right = -76.93186, top = 39.12351),
  maptype = "terrain",
  zoom = 11)
departure_by_station<-Trips%>%
  left_join(Stations, by = c("sstation" = "name"))%>%
  group_by(lat, long)%>%
  summarise(n=n(), prop_casual = mean(client == "Casual"))
ggmap(dc_map)+
  geom_point(data=departure_by_station,
             aes(x=long,
             y=lat,
             color=prop_casual),
  alpha=0.8,
  shape=17)+
  scale_color_viridis_c()
```
  
### COVID-19 data

The following exercises will use the COVID-19 data from the NYT.

  11. Create a map that colors the states by the most recent cumulative number of COVID-19 cases (remember, these data report cumulative numbers so you don't need to compute that). Describe what you see. What is the problem with this map?
  
The map shows the cumulative number of Covid19 in each state. From the graph, we can see that Texas and California have the most cumulative cases in the U.S.. The problem with this map is that it doesn't show the relationship between the number of cumulative cases and the population density, given that each state has different population. 
```{r}
states_map<-map_data("state")

covid19%>%
  group_by(state)%>%
  summarise(total = max(cases))%>%
  mutate(state = str_to_lower(state))%>%
  ggplot()+
  geom_map(map = states_map,
           aes(map_id = state,
               fill = total))+
  expand_limits(x = states_map$long, y = states_map$lat)+
  theme_map()

```
  
  12. Now add the population of each state to the dataset and color the states by most recent cumulative cases/10,000 people. See the code for doing this with the Starbucks data. You will need to make some modifications. 
```{r}
census_pop_est_2018 <- read_csv("https://www.dropbox.com/s/6txwv3b4ng7pepe/us_census_2018_state_pop_est.csv?dl=1") %>% 
  separate(state, into = c("dot","state"), extra = "merge") %>% 
  select(-dot) %>% 
  mutate(state = str_to_lower(state))

covid19%>%
  group_by(state)%>%
  summarise(total=max(cases))%>%
  mutate(state = str_to_lower(state))%>%
  left_join(census_pop_est_2018,
            by=c("state"="state"))%>%
  mutate(num_cases_per_10000 = (total/est_pop_2018)*10000)%>%
  ggplot()+
  geom_map(map = states_map,
           aes(map_id = state,
               fill = num_cases_per_10000))+
  expand_limits(x = states_map$long, y = states_map$lat)+
  theme_map()
          

```
  
  13. **CHALLENGE** Choose 4 dates spread over the time period of the data and create the same map as in exercise 12 for each of the dates. Display the four graphs together using faceting. What do you notice?
  
## Minneapolis police stops

These exercises use the datasets `MplsStops` and `MplsDemo` from the `carData` library. Search for them in Help to find out more information.

  14. Use the `MplsStops` dataset to find out how many stops there were for each neighborhood and the proportion of stops that were for a suspicious vehicle or person. Sort the results from most to least number of stops. Save this as a dataset called `mpls_suspicious` and display the table.  
```{r}
summary(MplsStops)
```
  
  
```{r}
mpls_suspicious<-MplsStops%>%
  group_by(neighborhood)%>%
  summarise(number_stops = n(),
            n_suspicious = sum(problem == "suspicious"),
            prop_suspicious = n_suspicious/number_stops)%>%
  arrange(desc(number_stops))
```
  
  15. Use a `leaflet` map and the `MplsStops` dataset to display each of the stops on a map as a small point. Color the points differently depending on whether they were for suspicious vehicle/person or a traffic stop (the `problem` variable). HINTS: use `addCircleMarkers`, set `stroke = FAlSE`, use `colorFactor()` to create a palette.  
```{r}
pal_problem<-colorFactor("viridis", 
                         domain = MplsStops$problem)
leaflet(MplsStops)%>%
  addProviderTiles(providers$Stamen.Toner)%>%
  addCircles(lng = ~long,
             lat = ~lat,
             color = ~pal_problem(problem),
             weight = 0.5,
             opacity = 0.4)%>%
  addLegend(pal = pal_problem,
            values = ~problem)
```
  
  16. Save the folder from moodle called Minneapolis_Neighborhoods into your project/repository folder for this assignment. Make sure the folder is called Minneapolis_Neighborhoods. Use the code below to read in the data and make sure to **delete the `eval=FALSE`**. Although it looks like it only links to the .sph file, you need the entire folder of files to create the `mpls_nbhd` data set. These data contain information about the geometries of the Minneapolis neighborhoods. Using the `mpls_nbhd` dataset as the base file, join the `mpls_suspicious` and `MplsDemo` datasets to it by neighborhood (careful, they are named different things in the different files). Call this new dataset `mpls_all`.

```{r}
mpls_nbhd <- st_read("Minneapolis_Neighborhoods/Minneapolis_Neighborhoods.shp", quiet = TRUE)
```

```{r}
mpls_all<-mpls_nbhd %>%
  left_join(mpls_suspicious,
            by = c("BDNAME" = "neighborhood"))%>%
  left_join(MplsDemo,
            by = c("BDNAME" = "neighborhood"))
```

  17. Use `leaflet` to create a map from the `mpls_all` data  that colors the neighborhoods by `prop_suspicious`. Display the neighborhood name as you scroll over it. Describe what you observe in the map.
```{r}
pal_sus<-colorNumeric("viridis",
                      domain = mpls_all$prop_suspicious)
leaflet(mpls_all)%>%
  addProviderTiles(providers$Stamen.Toner)%>%
  addPolygons(fillColor = ~pal_sus(prop_suspicious),
              fillOpacity = 0.5,
              label = ~BDNAME,
              color = "black",
              weight = 1,
              opacity = 1)%>%
  addLegend(pal = pal_sus,
            values = ~prop_suspicious)
```
  
  18. Use `leaflet` to create a map of your own choosing. Come up with a question you want to try to answer and use the map to help answer that question. Describe what your map shows. 
Question:Where do most of my favorite places concentrate?
My map shows where my favorite places locate in Twin Cities. It also shows that most of my favorite places concentrate in St. Paul. Many of them are places around campus. 

```{r}
pal <- colorFactor(palette(c("red", "blue")),
                   domain = favorite_places$top_three)
  
leaflet(data=favorite_places)%>%
  addTiles()%>%
  addProviderTiles(providers$CartoDB.Voyager)%>%
  addCircles(lng = ~long,
             lat = ~lat,
             label = ~place,
             weight = 10,
             opacity = 1,
             color = ~pal(top_three))%>%
  addLegend("bottomleft",
            pal = pal,
            values = ~top_three,
            opacity = 1)%>%
  addPolylines(lng = ~long,
               lat = ~lat,
               color="white",
               weight = 1)

```
  
  
GitHub link

  19. Below, provide a link to your GitHub page with this set of Weekly Exercises. Specifically, if the name of the file is 04_exercises.Rmd, provide a link to the 04_exercises.md file, which is the one that will be most readable on GitHub.
[github_link](https://github.com/Liujiashu2018/weekly_exercise04/blob/main/Jiashu%20Liu_04_exercises.Rmd)


